SEOUL, Nov. 22 (Yonhap) -- An opposition lawmaker detonated a tear gas canister inside the National Assembly's main chamber on Tuesday in protest at the ruling party's move to force through a free trade agreement with the United States.

Rep. Kim Sun-dong of the Democratic Labor Party (DLP) was in the full parliamentary session at around 4 p.m. when lawmakers of the ruling Grand National Party abruptly called a plenary session in an apparent move to ratify the bill.

Kim threw the tear gas bomb near the Speaker's seat, where vice parliamentary speaker Chung Ui-hwa was sitting at the time.

Kim was immediately taken away by Assembly police from the main chamber.